Introduce TransactionExecutionListener with begin/commit/rollback notifications

Includes ConfigurableTransactionManager interface for listener registration.
Includes additional introspection methods on TransactionExecution interface.
Includes default method declarations on TransactionStatus/SmartTransactionObject.

Closes gh-27479

spring-jms/src/main/java/org/springframework/jms/connection/JmsTransactionManager.java

@@ -448,11 +448,6 @@ public class JmsTransactionManager extends AbstractPlatformTransactionManager
 		public boolean isRollbackOnly() {
 			return (this.resourceHolder != null && this.resourceHolder.isRollbackOnly());
 		}
-
-		@Override
-		public void flush() {
-			// no-op
-		}
 	}
 
 }